If you think about it, the two are very similar.Let's look at their similarities, shall we?1. Both are "the Ultimate (insert thing here)"2. Both were created in a laboratory by a scientist with a female relative: Shadow was created by Gerald and Maria Robotink while Kira was created by Doctor Hibiki and his wife.3. Both were the targets of a major organization that uses violence to get their point across around the time of their creation: G.U.N (Shadow) and Blue Cosmos (Kira)4. Both are often blatantly angst5. Both have tan skin6. Both have a unsuccessful prototype who wants to destroy them: The Biolizard (Shadow) and Canard Pars (Kira)Also, if you put the three letters "SWD" into Kira's full name (Kira Hibiki Yamato), you can spell the word "Shadow". Coincidence...I think not! - PerfectImpulseX

10Lisa Loud (The Loud House) and Dexter (Dexter's Laboratory)

Their personalities are kinda similar because they're both smart. - TLHFanBaseSucks